Multiple gene expression analyses in human lymphoid tissues by taqman low-density array using amplified rna isolated...

Area of Science:

• Molecular Biology
• Genomics
• Biotechnology

Background:

• Archival tissues fixed in paraffin are valuable resources for retrospective studies.
• RNA extracted from these samples is often highly degraded, limiting its use for gene expression analysis.

Purpose of the Study:

• To develop and validate a method for amplifying RNA from fixed and paraffin-embedded tissues.
• To assess the conservation of gene expression profiles after RNA amplification.
• To evaluate the utility of TaqMan low-density arrays for analyzing amplified RNA from archival samples.

Main Methods:

• RNA extraction from fixed and paraffin-embedded tissues using a modified method.
• Linear amplification of extracted RNA.
• Gene expression analysis using TaqMan low-density arrays.
• Correlation analysis of gene expression in matched frozen and paraffin-embedded tissues.

Main Results:

• Achieved a 1200 to 3500-fold increase in RNA yield from degraded samples.
• Demonstrated higher cDNA yield and polymerase chain reaction amplification efficiency in amplified RNA.
• Showed strong correlations in Ct and DeltaCt values between amplified and unamplified samples, confirming gene expression conservation.

Conclusions:

• Small amounts of RNA from paraffin-embedded tissues can be successfully amplified without altering gene expression profiles.
• TaqMan low-density array technology is suitable for analyzing amplified RNA from archival fixed and paraffin-embedded lymphoid tissues.